QGIS API Documentation 3.36.0-Maidenhead (09951dc0acf)
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qgsdoubleboxscalebarrenderer.cpp
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1/***************************************************************************
2 qgsdoubleboxscalebarrenderer.cpp
3 --------------------------------
4 begin : June 2008
5 copyright : (C) 2008 by Marco Hugentobler
7 ***************************************************************************/
8/***************************************************************************
9 * *
10 * This program is free software; you can redistribute it and/or modify *
11 * it under the terms of the GNU General Public License as published by *
12 * the Free Software Foundation; either version 2 of the License, or *
13 * (at your option) any later version. *
14 * *
15 ***************************************************************************/
16
18#include "qgsscalebarsettings.h"
19#include "qgssymbol.h"
20#include "qgstextrenderer.h"
21#include "qgslinesymbol.h"
22#include "qgsfillsymbol.h"
23#include <QList>
24#include <QPainter>
25
27{
28 return QStringLiteral( "Double Box" );
29}
30
32{
33 return QObject::tr( "Double Box" );
34}
35
49
51{
52 return 2;
53}
54
59
60void QgsDoubleBoxScaleBarRenderer::draw( QgsRenderContext &context, const QgsScaleBarSettings &settings, const ScaleBarContext &scaleContext ) const
61{
62 if ( !context.painter() )
63 {
64 return;
65 }
66 QPainter *painter = context.painter();
67
68 const double scaledLabelBarSpace = context.convertToPainterUnits( settings.labelBarSpace(), Qgis::RenderUnit::Millimeters );
69 const double scaledBoxContentSpace = context.convertToPainterUnits( settings.boxContentSpace(), Qgis::RenderUnit::Millimeters );
70 const QFontMetricsF fontMetrics = QgsTextRenderer::fontMetrics( context, settings.textFormat() );
71 const double barTopPosition = scaledBoxContentSpace + ( settings.labelVerticalPlacement() == QgsScaleBarSettings::LabelAboveSegment ? fontMetrics.ascent() + scaledLabelBarSpace : 0 );
72 const double segmentHeight = context.convertToPainterUnits( settings.height() / 2, Qgis::RenderUnit::Millimeters );
73
74 painter->save();
75 context.setPainterFlagsUsingContext( painter );
76
77 std::unique_ptr< QgsLineSymbol > lineSymbol( settings.lineSymbol()->clone() );
78 lineSymbol->startRender( context );
79
80 std::unique_ptr< QgsFillSymbol > fillSymbol1( settings.fillSymbol()->clone() );
81 fillSymbol1->startRender( context );
82
83 std::unique_ptr< QgsFillSymbol > fillSymbol2( settings.alternateFillSymbol()->clone() );
84 fillSymbol2->startRender( context );
85
86 painter->setPen( Qt::NoPen );
87 painter->setBrush( Qt::NoBrush );
88
89 bool useColor = true; //alternate brush color/white
90
91 const double xOffset = firstLabelXOffset( settings, context, scaleContext );
92
93 const QList<double> positions = segmentPositions( context, scaleContext, settings );
94 const QList<double> widths = segmentWidths( scaleContext, settings );
95
96 double minX = 0;
97 double maxX = 0;
98 QgsFillSymbol *currentSymbol = nullptr;
99 for ( int i = 0; i < positions.size(); ++i )
100 {
101 //draw top half
102 if ( useColor )
103 {
104 currentSymbol = fillSymbol1.get();
105 }
106 else //secondary symbol
107 {
108 currentSymbol = fillSymbol2.get();
109 }
110
111 const double thisX = context.convertToPainterUnits( positions.at( i ), Qgis::RenderUnit::Millimeters ) + xOffset;
112 const double thisWidth = context.convertToPainterUnits( widths.at( i ), Qgis::RenderUnit::Millimeters );
113
114 if ( i == 0 )
115 minX = thisX;
116 if ( i == positions.size() - 1 )
117 maxX = thisX + thisWidth;
118
119 const QRectF segmentRectTop( thisX, barTopPosition, thisWidth, segmentHeight );
120 currentSymbol->renderPolygon( QPolygonF()
121 << segmentRectTop.topLeft()
122 << segmentRectTop.topRight()
123 << segmentRectTop.bottomRight()
124 << segmentRectTop.bottomLeft()
125 << segmentRectTop.topLeft(),
126 nullptr, nullptr, context );
127 painter->drawRect( segmentRectTop );
128
129 //draw bottom half
130 if ( useColor )
131 {
132 //secondary symbol
133 currentSymbol = fillSymbol2.get();
134 }
135 else //primary symbol
136 {
137 currentSymbol = fillSymbol1.get(); ;
138 }
139
140 const QRectF segmentRectBottom( thisX, barTopPosition + segmentHeight, thisWidth, segmentHeight );
141
142 currentSymbol->renderPolygon( QPolygonF()
143 << segmentRectBottom.topLeft()
144 << segmentRectBottom.topRight()
145 << segmentRectBottom.bottomRight()
146 << segmentRectBottom.bottomLeft()
147 << segmentRectBottom.topLeft(),
148 nullptr, nullptr, context );
149 useColor = !useColor;
150 }
151
152
153 // and then the lines
154 // note that we do this layer-by-layer, to avoid ugliness where the lines touch the outer rect
155 for ( int layer = 0; layer < lineSymbol->symbolLayerCount(); ++layer )
156 {
157 // vertical lines
158 for ( int i = 1; i < positions.size(); ++i )
159 {
160 const double lineX = context.convertToPainterUnits( positions.at( i ), Qgis::RenderUnit::Millimeters ) + xOffset;
161 lineSymbol->renderPolyline( QPolygonF()
162 << QPointF( lineX, barTopPosition )
163 << QPointF( lineX, barTopPosition + segmentHeight * 2 ),
164 nullptr, context, layer );
165 }
166
167 // middle horizontal line
168 lineSymbol->renderPolyline( QPolygonF()
169 << QPointF( minX, barTopPosition + segmentHeight )
170 << QPointF( maxX, barTopPosition + segmentHeight ),
171 nullptr, context, layer );
172
173
174 // outside line
175 lineSymbol->renderPolyline( QPolygonF()
176 << QPointF( minX, barTopPosition )
177 << QPointF( maxX, barTopPosition )
178 << QPointF( maxX, barTopPosition + segmentHeight * 2 )
179 << QPointF( minX, barTopPosition + segmentHeight * 2 )
180 << QPointF( minX, barTopPosition ),
181 nullptr, context, layer );
182 }
183
184 lineSymbol->stopRender( context );
185 fillSymbol1->stopRender( context );
186 fillSymbol2->stopRender( context );
187
188 painter->restore();
189
190 //draw labels using the default method
191 drawDefaultLabels( context, settings, scaleContext );
192}
@ Millimeters
Millimeters.
Double box with alternating colors.
Flags flags() const override
Returns the scalebar rendering flags, which dictates the renderer's behavior.
QgsDoubleBoxScaleBarRenderer()=default
Constructor for QgsDoubleBoxScaleBarRenderer.
void draw(QgsRenderContext &context, const QgsScaleBarSettings &settings, const QgsScaleBarRenderer::ScaleBarContext &scaleContext) const override
Draws the scalebar using the specified settings and scaleContext to a destination render context.
QString id() const override
Returns the unique ID for this renderer.
QString visibleName() const override
Returns the user friendly, translated name for the renderer.
QgsDoubleBoxScaleBarRenderer * clone() const override
Returns a clone of the renderer.
int sortKey() const override
Returns a sorting key value, where renderers with a lower sort key will be shown earlier in lists.
A fill symbol type, for rendering Polygon and MultiPolygon geometries.
void renderPolygon(const QPolygonF &points, const QVector< QPolygonF > *rings, const QgsFeature *f, QgsRenderContext &context, int layer=-1, bool selected=false)
Renders the symbol using the given render context.
QgsFillSymbol * clone() const override
Returns a deep copy of this symbol.
QgsLineSymbol * clone() const override
Returns a deep copy of this symbol.
Contains information about the context of a rendering operation.
double convertToPainterUnits(double size, Qgis::RenderUnit unit, const QgsMapUnitScale &scale=QgsMapUnitScale(), Qgis::RenderSubcomponentProperty property=Qgis::RenderSubcomponentProperty::Generic) const
Converts a size from the specified units to painter units (pixels).
QPainter * painter()
Returns the destination QPainter for the render operation.
void setPainterFlagsUsingContext(QPainter *painter=nullptr) const
Sets relevant flags on a destination painter, using the flags and settings currently defined for the ...
void drawDefaultLabels(QgsRenderContext &context, const QgsScaleBarSettings &settings, const QgsScaleBarRenderer::ScaleBarContext &scaleContext) const
Draws default scalebar labels using the specified settings and scaleContext to a destination render c...
QList< double > segmentWidths(const QgsScaleBarRenderer::ScaleBarContext &scaleContext, const QgsScaleBarSettings &settings) const
Returns a list of widths of each segment of the scalebar.
Q_DECL_DEPRECATED QList< double > segmentPositions(const QgsScaleBarRenderer::ScaleBarContext &scaleContext, const QgsScaleBarSettings &settings) const
Returns a list of positions for each segment within the scalebar.
Q_DECL_DEPRECATED double firstLabelXOffset(const QgsScaleBarSettings &settings) const
Returns the x-offset (in millimeters) used for the first label in the scalebar.
@ FlagUsesLabelVerticalPlacement
Renderer uses the QgsScaleBarSettings::labelVerticalPlacement() setting.
@ FlagUsesLabelHorizontalPlacement
Renderer uses the QgsScaleBarSettings::labelHorizontalPlacement() setting.
@ FlagUsesLineSymbol
Renderer utilizes the scalebar line symbol (see QgsScaleBarSettings::lineSymbol() )
@ FlagUsesUnitLabel
Renderer uses the QgsScaleBarSettings::unitLabel() setting.
@ FlagUsesSegments
Renderer uses the scalebar segments.
@ FlagUsesLabelBarSpace
Renderer uses the QgsScaleBarSettings::labelBarSpace() setting.
@ FlagUsesFillSymbol
Renderer utilizes the scalebar fill symbol (see QgsScaleBarSettings::fillSymbol() )
@ FlagRespectsMapUnitsPerScaleBarUnit
Renderer respects the QgsScaleBarSettings::mapUnitsPerScaleBarUnit() setting.
@ FlagRespectsUnits
Renderer respects the QgsScaleBarSettings::units() setting.
@ FlagUsesAlternateFillSymbol
Renderer utilizes the alternate scalebar fill symbol (see QgsScaleBarSettings::alternateFillSymbol() ...
The QgsScaleBarSettings class stores the appearance and layout settings for scalebar drawing with Qgs...
QgsLineSymbol * lineSymbol() const
Returns the line symbol used to render the scalebar (only used for some scalebar types).
QgsTextFormat & textFormat()
Returns the text format used for drawing text in the scalebar.
double boxContentSpace() const
Returns the spacing (margin) between the scalebar box and content in millimeters.
QgsFillSymbol * alternateFillSymbol() const
Returns the secondary fill symbol used to render the scalebar (only used for some scalebar types).
QgsFillSymbol * fillSymbol() const
Returns the primary fill symbol used to render the scalebar (only used for some scalebar types).
LabelVerticalPlacement labelVerticalPlacement() const
Returns the vertical placement of text labels.
@ LabelAboveSegment
Labels are drawn above the scalebar.
double labelBarSpace() const
Returns the spacing (in millimeters) between labels and the scalebar.
double height() const
Returns the scalebar height (in millimeters).
static QFontMetricsF fontMetrics(QgsRenderContext &context, const QgsTextFormat &format, double scaleFactor=1.0)
Returns the font metrics for the given text format, when rendered in the specified render context.
Contains parameters regarding scalebar calculations.